Patent
1997-10-29
1998-10-13
Sheikh, Ayaz R.
395306, 395308, G06F 1502
Patent
active
058225455
ABSTRACT:
A method and apparatus for eliminating all unnecessary switching/toggling of bus signals is provided. A first circuit that is coupled to a first and second bus is provided. This first circuit selectively couples (i.e., transparently passes) a first signal from the first bus to the second bus in response to a control signal. A control/decoder circuit, coupled to the first circuit, generates the control signal based upon whether or not a bus cycle on the first bus is directed to a device coupled to the second bus. If the address is directed toward a device coupled to the second bus, the present invention transparently passes the bus signals on the first bus to the second bus. If not, the control/decoder circuit instructs the first circuit not to propagate the bus signals from the first bus to the second bus. In other words, the value of the bus signals on the second bus are unchanged.
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Cypress Semiconductor Corp.
Dharia Rupal D.
Sheikh Ayaz R.
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